For connection to the main supply of 1 or up to 10 connected lamps. Turn them all on and off simultaneously with a single cord switch. http://www.ikea.com/ca/en/images/products/ansluta-power-supply-cord__77429_PE199012_S4.JPGANSLUTA Power supply cordhttp://www.ikea.com/ca/en/catalog/products/30121411/301.214.11$7.99